Make sure we have a show_usage function prototype

[oweals/busybox.git] / networking / udhcp / clientpacket.c

diff --git a/networking/udhcp/clientpacket.c b/networking/udhcp/clientpacket.c
index ecbd7953f0ecd69092c33c2e1e67ba33666f1802..86faec925d446c6896a4978f60d81daf07460d4d 100644 (file)
--- a/networking/udhcp/clientpacket.c
+++ b/networking/udhcp/clientpacket.c
@@ -35,6 +35,10 @@
 #include <unistd.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 
 
 #include "dhcpd.h"
@@ -49,7 +53,17 @@ unsigned long random_xid(void)
 {
        static int initialized;
        if (!initialized) {
-               srand(time(0));
+               int fd;
+               unsigned long seed;
+
+               fd = open("/dev/urandom", 0);
+               if (fd < 0 || read(fd, &seed, sizeof(seed)) < 0) {
+                       LOG(LOG_WARNING, "Could not load seed from /dev/urandom: %s",
+                               strerror(errno));
+                       seed = time(0);
+               }
+               if (fd >= 0) close(fd);
+               srand(seed);
                initialized++;
        }
        return rand();